67 lines
923 B
ArmAsm
67 lines
923 B
ArmAsm
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/*
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* Public domain.
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*/
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#include <machine/asm.h>
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#include <i386-math-asm.h>
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RCSID("$NetBSD: s_log1pf.S,v 1.4 1995/05/09 00:13:05 jtc Exp $")
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.section .rodata
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.align ALIGNARG(4)
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/* The fyl2xp1 can only be used for values in
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-1 + sqrt(2) / 2 <= x <= 1 - sqrt(2) / 2
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0.29 is a safe value.
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*/
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limit: .float 0.29
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one: .float 1.0
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DEFINE_FLT_MIN
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#ifdef PIC
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# define MO(op) op##@GOTOFF(%edx)
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#else
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# define MO(op) op
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#endif
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/*
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* Use the fyl2xp1 function when the argument is in the range -0.29 to 0.29,
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* otherwise fyl2x with the needed extra computation.
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*/
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.text
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ENTRY(__log1pf)
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fldln2
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flds 4(%esp)
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#ifdef PIC
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LOAD_PIC_REG (dx)
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#endif
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fxam
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fnstsw
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fld %st
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sahf
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jc 3f // in case x is NaN or <EFBFBD>Inf
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4: fabs
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fcomps MO(limit)
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fnstsw
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sahf
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jc 2f
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fadds MO(one)
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fyl2x
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ret
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2: fyl2xp1
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FLT_CHECK_FORCE_UFLOW_NONNAN
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ret
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3: jp 4b // in case x is <EFBFBD>Inf
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fstp %st(1)
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fstp %st(1)
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ret
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END (__log1pf)
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